Centrifugal pump.



I H. LEGRos. GENTRIFUGAL.. PUMP.

APPLICATION FILED JULY 23,1909.

SEE

- eqllilibratillg the axial HENRI Enanos, 'or BRUSSELS, BELGIUM. v

CENTEIFUGAL PUMP.

Specification ofvLetters Patent. 'Applieatimi sled July 23, lebe. serial No.

Patented July 5, 1910. 509,091'.

To all whom 'Lima/y concern:

Be it known that I, HENRI LEGRos, a subject of theA Belgian Kingdom, residing in Brussels, in the Belgian Kingdom, engineer, f

useful Imhave invented certainnew and y provements in Centrifugal Pumps, ,y for which an application 4has been made 1n Bel# gium July 24 of 1908, No. 209,813;` Ger! lnany, October 26 of 1908.

This lnvention relates to improvements fin centrifugal pumps, withithe view of thrust, by "employing, for'this purpose, a little quantity-of the water flowed back by these pumps. This.,

disposition, which is applied tofplimps in which the rotary body can have la slight axial displacelnent, is specially studied :forv reducing to a minimum the water` loss necessary to reach the view pursuedand -inorder that the proportionality of this loss be sensibly the same, whatever be the pressure of water in the pressure chamber of the pump.

The annexed drawing represents a prac. tical* realization of this invention.

A is the pump shaft; B the rotary body; C the pressure chamber bottom; D the platebearing, on the pressure chamber side, bearf ing the stuffing-box E.

adapted, in any convenient way, an auxiliary chamber l, in'which the water con-y site to the corresponding face b of an annular projection forming one part withthe wall of the chamber 1. In these conditions, it is seen that, for going from the pressure chamber 2 to the auxiliary chamber 1, the

water musa-first, flow tllrough the first joint' a 6 formed bythe disk 3,'tendingvto shut the opening of said chamber 1;, The water which fills this chamber 1, can flow outwardly, through a conduct-pipe 4, provided with a regulating valve 5.

When the pump lis in service, the axial thrust tends `to displace the rotary body B, and with it, the disk or disks 3, in the di- Vrection indicated by the arrow but, the f water flowing into the pressure chamber2, acts upon the first disk 8; which resists toits passage in the auxiliary chamber 1, and equilibrates the axial thrust by forcing back #this disk with the rotary body with whichv x trate into the auxiliary above description,

' tion.

it vis united, in the directionr indicated by the arrow y, so opening a passage to penechamber 1. Inany into the auxiliary y through the conunderstood that, if

case, the water lenterin chamber flows outward vductipe- 4, and it is itis sure .t at the axial thrust is equilibrated. f

It is evident that, by acting upon the valve .5,"it is possible to reduce the flowing of the' this owing is controlled, that is eas vto dov .ln any manner whatever,

water, through the conduct-pipe 4, without:-

injury to the equilibrium; but, if the water, entering the freely discharge, a counterpressureis created .insaid chamber. This Icounterpressure, varying with the pressure existing in the pressure chamber 1,the n acts upon the faces c of the disk or disks 3, which are forced back-in the same direction 'rl/ .as the axial thrust, Ithe effect ofthis being t'o reduce the section or' sections of passage a b. The disposition described can therefore be regulated so asA vto vautomatically reduce to a desired minimum the water loss, caused by the equilibrium of the axial thrust, whatever be the water pr essure,.in the pressure 'chamber of the pump.` O n the internal face of the bottom C is' It is important to remark that, along the utilization of one or several disks 3; it will be understood, in fact, that the number of these disks has no importance in this disposi- A single disk or a multiplicity of such disks can be utilized; but, the use of several disks oers vthe advantage of reducing'the wear, and, consequently, the axial displacement. of

can be varied; it is possible, if necessary, vto have the water cleared from the auxiliary chamber 1, l into a second chamber 6, this water passingeither through a around the rotary body, in 7, or through one or several'channels 8, situatedin the bottom C. In this case, the valve 5 would naturally 4be placed upon the pipe 9, leading from the chamber 6. Lastly, the valve 5 can be eliminated the pipes 4 orf-8, or. the leak 7 are ascertalned for a 'minimum discharge. The `form and dimensions. Vof the constitutive elements of this disposition for equilibrat- .ing'the axial thrust can be varied, without .departing from the broad features of thel invention, whichv can be employedV in compressors, steam-turblnes, and the like.

auxiliary chamber 1, cannot leak existing itl has been talked of the the rotary body B. Like. l wise, thedisposition of the conduct-pipe 4 y Qa Having thus described the invention, 'what .I claim as new and desire to secure by Letters Patent, is:

equalizing the axial ,thrust which consists f an auxiliary chamber, disks therein, a rotaryV body carrying said disks, a chamber containing said disks and having annular projetktions, the pump body having an auxiliary chamber withmeans for automatically regu- I a'ting the admission ofI water for the equalizing action, the internal facezofv each'disk being disposed oppositeto the corresponding face of'each projection. y 2. In a centrifugal pump, means for equalizing theaxialvthrus't which consists of an auxiliary'chamber, disks therein, a rotary' body carrying said disks, ing said disks and havin tions, lthe internal face 0% each. disk being disposedI opposite to the corresponding face a chamber contain-` annularprojec-l.

@eases of each projection, a pressure' chambera conduit Yrom-Said auxiliary chamber, and a 'regulating valve therein. v1. In a centrifugal pump, means for 3. In a centrifugal pump,means for equal- .izing the axial thrust, which consists of an auxiliary chamber, aldisk therein, a rotary y body carrying said disk, a chamber contain-y ing said disk and having. annular projections, the pumpbody having an auxiliary chamber wlth means for automatically vregulating the admission of 'water for the equalizing action, the internal face of the disk', being disposed opposite to the corresponding face of an annular projection.

name to this specication, in the presence of two subscribing witnesses.

4 v HENRI LEGROS.

Witnesses;

ALPHONSE MJEAN, JAMES .M. G. FAY.

' In testimony whereof I have signed my 

